Brocade Communications Systems IPMC5000PEF 사용자 설명서

Disabling IGMP snooping on a VLAN

When IGMP snooping is enabled globally, you can still disable it for a specific VLAN. For example, the
following commands cause IGMP snooping to be disabled for VLAN 20. This setting overrides the
global setting.

device(config)#vlan 20

device(config-vlan-20)#multicast disable-multicast-snoop

Syntax: [no] multicast disable-multicast-snoop

Modifying the age interval for group membership entries

When the device receives a group membership report, it makes an entry for that group in the IGMP
group table. The age interval specifies how long the entry can remain in the table before the device
receives another group membership report. When multiple devices connect together, all devices must
be configured for the same age interval, which must be at least twice the length of the query interval,
so that missing one report won't stop traffic. Non-querier age intervals must be the same as the age
interval of the querier.

To modify the age interval, enter the following command.

device(config)#ip multicast age-interval 280

Syntax: [no] ip multicast age-interval interval

The interval parameter specifies the aging time. You can specify a value from 20 through 26000
seconds. The default is 260 seconds.

Modifying the query interval (active IGMP snooping mode only)

If IP multicast traffic reduction is set to active mode, you can modify the query interval to specify how
often the device sends general queries. When multiple queriers connect together, they must all be
configured with the same query interval.

To modify the query interval, enter the following command.

device(config)#ip multicast query-interval 120

Syntax: [no] ip multicast query-intervalinterval

The interval parameter specifies the time between queries. You can specify a value from 10 through
3600 seconds. The default is 125 seconds.

Modifying the maximum response time

The maximum response time is the number of seconds that a client can wait before responding to a
query sent by the switch.

To change the maximum response time, enter the following command.

device(config)#ip multicast max-response-time 5

Syntax: [no] ip multicast max-response-time interval

For interval , enter a value from 1 through 10 seconds. The default is 10 seconds.

Disabling IGMP snooping on a VLAN